[U-Boot] [PATCH 3/4] OneNAND: Add simple OneNAND SPL
Marek Vasut
marek.vasut at gmail.com
Mon Oct 31 14:23:12 CET 2011
This introduces small OneNAND loader, fitting into 1kB of space (smallest
possible OneNAND RAM size). Some devices equipped with such crappy chips will
use this.
Signed-off-by: Marek Vasut <marek.vasut at gmail.com>
Cc: Albert ARIBAUD <albert.u.boot at aribaud.net>
Cc: Kyungmin Park <kyungmin.park at samsung.com>
Cc: Scott Wood <scottwood at freescale.com>
---
drivers/mtd/onenand/Makefile | 4 +
drivers/mtd/onenand/onenand_spl.c | 130 +++++++++++++++++++++++++++++++++++++
include/onenand_uboot.h | 18 +++++
spl/Makefile | 1 +
4 files changed, 153 insertions(+), 0 deletions(-)
create mode 100644 drivers/mtd/onenand/onenand_spl.c
diff --git a/drivers/mtd/onenand/Makefile b/drivers/mtd/onenand/Makefile
index b984bd4..b090d40 100644
--- a/drivers/mtd/onenand/Makefile
+++ b/drivers/mtd/onenand/Makefile
@@ -25,8 +25,12 @@ include $(TOPDIR)/config.mk
LIB := $(obj)libonenand.o
+ifndef CONFIG_SPL_BUILD
COBJS-$(CONFIG_CMD_ONENAND) := onenand_uboot.o onenand_base.o onenand_bbt.o
COBJS-$(CONFIG_SAMSUNG_ONENAND) += samsung.o
+else
+COBJS-y := onenand_spl.o
+endif
COBJS := $(COBJS-y)
SRCS := $(COBJS:.o=.c)
diff --git a/drivers/mtd/onenand/onenand_spl.c b/drivers/mtd/onenand/onenand_spl.c
new file mode 100644
index 0000000..5429972
--- /dev/null
+++ b/drivers/mtd/onenand/onenand_spl.c
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2011 Marek Vasut <marek.vasut at gmail.com>
+ *
+ * Based on code:
+ * Copyright (C) 2005-2009 Samsung Electronics
+ * Kyungmin Park <kyungmin.park at samsung.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <linux/mtd/onenand_regs.h>
+#include <onenand_uboot.h>
+
+inline uint16_t onenand_readw(uint32_t addr)
+{
+ return readw(CONFIG_SYS_ONENAND_BASE + addr);
+}
+
+inline void onenand_writew(uint16_t value, uint32_t addr)
+{
+ writew(value, CONFIG_SYS_ONENAND_BASE + addr);
+}
+
+
+#define onenand_block_address(block) (block)
+#define onenand_sector_address(page) (page << 2)
+#define onenand_buffer_address() ((1 << 3) << 8)
+#define onenand_bufferram_address(block) (0)
+
+void spl_onenand_get_geometry(struct spl_onenand_data *data)
+{
+ uint32_t tmp;
+ uint32_t dev_id, density;
+
+ /* Default geometry -- 2048b page, 128k erase block. */
+ data->pagesize = 2048;
+ data->erasesize = 0x20000;
+
+ tmp = onenand_readw(ONENAND_REG_TECHNOLOGY);
+ if (tmp)
+ goto dev_4k;
+
+ dev_id = onenand_readw(ONENAND_REG_DEVICE_ID);
+ density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
+ density &= ONENAND_DEVICE_DENSITY_MASK;
+
+ if (density < ONENAND_DEVICE_DENSITY_4Gb)
+ return;
+
+ if (dev_id & ONENAND_DEVICE_IS_DDP)
+ return;
+
+ /* 4k device geometry -- 4096b page, 256k erase block. */
+dev_4k:
+ data->pagesize = 4096;
+ data->erasesize = 0x40000;
+}
+
+int spl_onenand_read_page(uint32_t block, uint32_t page,
+ uint8_t *buf, int pagesize)
+{
+ const uint32_t addr = CONFIG_SYS_ONENAND_BASE + ONENAND_DATARAM;
+ uint32_t offset;
+
+ onenand_writew(onenand_block_address(block),
+ ONENAND_REG_START_ADDRESS1);
+
+ onenand_writew(onenand_bufferram_address(block),
+ ONENAND_REG_START_ADDRESS2);
+
+ onenand_writew(onenand_sector_address(page),
+ ONENAND_REG_START_ADDRESS8);
+
+ onenand_writew(onenand_buffer_address(),
+ ONENAND_REG_START_BUFFER);
+
+ onenand_writew(ONENAND_INT_CLEAR, ONENAND_REG_INTERRUPT);
+
+ onenand_writew(ONENAND_CMD_READ, ONENAND_REG_COMMAND);
+
+ while (!(onenand_readw(ONENAND_REG_INTERRUPT) & ONENAND_INT_READ))
+ continue;
+
+ /* Check for invalid block mark */
+ if (page < 2 && (onenand_readw(ONENAND_SPARERAM) != 0xffff))
+ return 1;
+
+ for (offset = 0; offset < pagesize; offset++)
+ buf[offset] = readb(addr + offset);
+
+ return 0;
+}
+
+int spl_onenand_read_block(uint32_t block, uint8_t *buf, uint32_t *read)
+{
+ struct spl_onenand_data data;
+ uint32_t page;
+ int ret;
+
+ spl_onenand_get_geometry(&data);
+
+ for (page = 0; page < ONENAND_PAGES_PER_BLOCK; page++) {
+ ret = spl_onenand_read_page(block, page, buf, data.pagesize);
+ if (ret)
+ return ret;
+ buf += data.pagesize;
+ }
+
+ *read = ((block * ONENAND_PAGES_PER_BLOCK) + page) * data.pagesize;
+
+ return 0;
+}
diff --git a/include/onenand_uboot.h b/include/onenand_uboot.h
index 92279d5..66828ce 100644
--- a/include/onenand_uboot.h
+++ b/include/onenand_uboot.h
@@ -16,6 +16,8 @@
#include <linux/types.h>
+#ifndef CONFIG_SPL_BUILD
+
/* Forward declarations */
struct mtd_info;
struct mtd_oob_ops;
@@ -52,4 +54,20 @@ extern int flexonenand_set_boundary(struct mtd_info *mtd, int die,
extern void s3c64xx_onenand_init(struct mtd_info *);
extern void s3c64xx_set_width_regs(struct onenand_chip *);
+#else
+
+#define ONENAND_PAGES_PER_BLOCK 64
+
+struct spl_onenand_data {
+ uint32_t pagesize;
+ uint32_t erasesize;
+};
+
+void spl_onenand_get_geometry(struct spl_onenand_data *data);
+int spl_onenand_read_page(uint32_t block, uint32_t page,
+ uint8_t *buf, int pagesize);
+int spl_onenand_read_block(uint32_t block, uint8_t *buf, uint32_t *read);
+
+#endif
+
#endif /* __UBOOT_ONENAND_H */
diff --git a/spl/Makefile b/spl/Makefile
index ed1f770..d4184ac 100644
--- a/spl/Makefile
+++ b/spl/Makefile
@@ -54,6 +54,7 @@ LIBS-$(CONFIG_SPL_FAT_SUPPORT) += fs/fat/libfat.o
LIBS-$(CONFIG_SPL_LIBGENERIC_SUPPORT) += lib/libgeneric.o
LIBS-$(CONFIG_SPL_POWER_SUPPORT) += drivers/power/libpower.o
LIBS-$(CONFIG_SPL_NAND_SUPPORT) += drivers/mtd/nand/libnand.o
+LIBS-$(CONFIG_SPL_ONENAND_SUPPORT) += drivers/mtd/onenand/libonenand.o
LIBS-$(CONFIG_SPL_DMA_SUPPORT) += drivers/dma/libdma.o
ifeq ($(SOC),omap3)
--
1.7.6.3
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